Vehicle vision system camera with integrated physical layer components

ABSTRACT

A vision system for a vehicle includes an imager for a vehicular camera and a data receiving device operable to receive image data captured by the imager. A data transfer system communicates captured image data from the imager to the data receiving device. The data transfer system includes a single differential data line. The single differential data line may use a bi-directional high speed serial differential signaling protocol and a mixed signal PHY interface at each of a plurality of nodes of the single differential data line.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims the filing benefits of U.S. provisional application Ser. No. 61/772,015, filed Mar. 4, 2013, which is hereby incorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to imaging systems or vision systems for vehicles.

BACKGROUND OF THE INVENTION

Use of imaging sensors in vehicle imaging systems is common and known. Examples of such known systems are described in U.S. Pat. Nos. 5,949,331; 5,670,935; and/or 5,550,677, which are hereby incorporated herein by reference in their entireties.

SUMMARY OF THE INVENTION

The present invention provides a vision system or imaging system for a vehicle that utilizes one or more cameras to capture images exterior of the vehicle, and provides the communication/data signals, including camera data or image data that may be displayed or processed to provide the desired display images and/or processing and control, depending on the particular application of the camera and vision or imaging system.

The present invention provides a vision system that comprises an imager for an automotive camera that has integrated physical layer components. The present invention provides image data transfer to remote image processing devices, such as to a compartment display, head unit or ECU/MCU. The data transfer system of the present invention may use one differential data line (such as via low-voltage differential signaling or LVDS), which may be bidirectional, whereby the back channel is used for control. Optionally, a monodirectional LVDS interface may be used, whereby the control channel may be embodied by a separate camera communication interface.

These and other objects, advantages, purposes and features of the present invention will become apparent upon review of the following specification in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of a vehicle with a vision system and imaging sensors or cameras that provide exterior fields of view in accordance with the present invention;

FIGS. 2A and 2B are schematics of vision system wiring connections between an imager and a processor or data receiving device comprising a twisted wire connection in accordance with the present invention;

FIGS. 3A and 3B are schematics of other vision system wiring connections between an imager and a processor or data receiving device comprising a twisted wire connection in accordance with the present invention;

FIGS. 4A and 4B are schematics of vision system wiring connections between an imager and a processor or data receiving device comprising a coaxial cable connection in accordance with the present invention;

FIGS. 5A and 5B are schematics of other vision system wiring connections between an imager and a processor or data receiving device comprising a coaxial cable connection in accordance with the present invention;

FIGS. 6A and 6B are schematics of other vision system wiring connections between an imager and a processor or data receiving device comprising a coaxial cable connection in accordance with the present invention;

FIGS. 7A and 7B are schematics of other vision system wiring connections between an imager and a processor or data receiving device comprising a coaxial cable connection in accordance with the present invention; and

FIGS. 8A and 8B are schematics of other vision system wiring connections between an imager and a processor or data receiving device comprising a coaxial cable connection in accordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A driver assist system and/or vision system and/or object detection system and/or alert system may operate to capture images exterior of the vehicle and process the captured image data to detect objects at or near the vehicle and in the predicted path of the vehicle, such as to assist a driver of the vehicle in maneuvering the vehicle in a rearward direction. The object detection may utilize detection and analysis of moving vectors representative of objects detected in the field of view of the vehicle camera, in order to determine which detected objects are objects of interest to the driver of the vehicle, such as when the driver of the vehicle undertakes a reversing maneuver.

Referring now to the drawings and the illustrative embodiments depicted therein, a vehicle 10 includes an imaging system or vision system 12 that includes one or more imaging sensors or cameras (such as a rearward facing imaging sensor or camera 14 a and/or a forwardly facing camera 14 b at the front (or at the windshield) of the vehicle, and/or a sidewardly/rearwardly facing camera 14 c, 14 b at the sides of the vehicle), which capture images exterior of the vehicle, with the cameras having a lens for focusing images at or onto an imaging array or imaging plane of the camera (FIG. 1). The vision system 12 is operable to process image data captured by the cameras and may provide displayed images at a display device 16 for viewing by the driver of the vehicle. Optionally, the vision system may process image data to detect objects, such as objects to the rear of the subject or equipped vehicle during a reversing maneuver, or such as approaching or following vehicles or vehicles at a side lane adjacent to the subject or equipped vehicle or the like.

Automotive cameras use data transfer interfaces that may be integrated in the camera's PCB circuits for communicating to devices or components of a vehicle vision system that are exterior or remote from the camera. Such automotive cameras do not use data transfer interfaces that are integrated in or to the camera's imager or imaging array for communicating to devices or components of a vehicle vision system that are exterior or remote from the camera. As described in International Publication No. WO 2013/081985, which is hereby incorporated herein by reference in its entirety, suggests to use imager integrated data decoders and drivers for image data transfer.

There are several Camera Serial Interface standards from the MIPI Alliance. The latest Standard is CSI-3 besides CSI-1 and CSI-2. All are meant for transfer of image data over short distances such as across a PCB. A typical use case is to interconnect a mobile phone camera with the mobile phone image data engine across a mobile phones PCB lines. Data lines and clock signals are typically mono directional, and the CCI control link works bidirectional. That means that most of the data are flowing from the imager to the data engine. The data rate is specified to be from 1 Gbps up to 6 Gbps. See, for example, the Camera Interface Specifications on the MIPI alliance® website: [http://www.mipi.org/specifications/camera-interface#CSI3].

The present invention utilizes, but is not limited to, an imager-based MIPI D-PHY or M-PHY (and parts of CSI x) for automotive camera image data transfer to remote image processing devices, such as to a compartment display, compartment projector, head unit or ECU/MCU. MIPI is an interconnect protocol offering several key advantages: strong modularity allowing minimizing power but also reaching high bandwidth when necessary (such as 6 Gbps, or 12 Gbps or the like), a guaranteed interoperability between an Application Processor and peripheral IC coming from different sources (such as camera controllers (CMOS image sensors), display controller, RF modem, audio codec and the like). MIPI is a bi-directional high speed serial differential signaling protocol, power consumption optimized and dedicated to mobile, devices, and can be used to interface chips within the system, at the board level. It uses a controller (digital) and a mixed signal PHY. The D-PHY technology uses, for example, two clock wires per direction plus two signal wires per lane and per direction. For example a D-PHY might use two wires for the clock and four wires (two lanes) for the data in the forward direction, but two wires for the clock and six wires (three lanes) for the data in the reverse direction. Data traffic in the forward and reverse directions are totally independent at this level of the protocol stack. The preferred solution may use one differential data line (LVDS), which may be bidirectional. The back channel is used for control. Optionally, a monodirectional LVDS interface may be used, whereby the control channel may be embodied by a separate camera communication interface, such as a I2C, UART, LIN, CAN or SPI interface or the like. Optionally, a LVDS converter may come into use. As an alternative option, there may be an optical data line in use and having electrical to optical signal converters (sending node) and optical to electrical signal converters (receiving node), such as described, for example, on Meticom's website: http://www.meticom.com/page3/page31/DPHY_to_Optics.html.

In either case, the imager may have an additional logic for coping with the prolonged line length by using error correction, error and link status checking and for ecoding the image data stream in a DC-balanced format (such as, for example, 8b10b encoding), either with or without additional parity or error correction information. The preferred embodiment of the image data receiving device may be a Field-Programmable Gate Array (FPGA) comprising a multi standard (multiple protocols, multiple voltages, multiple (en-)coding schemes) PHY and parity processing logic (beside other functions). Optionally, error correction and/or error and link status checking may be done on the multi standard PHY side. Optionally, the present invention may use shielded (STP) or unshielded (UTP) twisted pair lines (such as shown in FIGS. 2A, 2B, 3A and 3B) or coaxial cable for transferring LVDS (such as shown in the embodiments of FIGS. 4A, 4B, 5A, 5B, 6A, 6B, 7A, 7B, 8A and 8B). Optionally, the camera's DC power supply may run over the same lines as the LVDS provided by the image receiving device, such as by utilizing aspects of the systems described in International Publication No. WO 2013/043661, which is hereby incorporated herein by reference in its entirety.

Optionally, the signal may be modulated to and transferred via an analog carrier wave by any kind of signal modulation (AM, FM, QAM or the like). The modulator may be a frequency adder (or mixer), and the demodulation at the corresponding other end may be a frequency filter, such as by utilizing aspects of the systems described in U.S. provisional application Ser. No. 61/833,080, filed Jun. 10, 2013, which is hereby incorporated herein by reference in its entirety. Also, as such as described in U.S. provisional application Ser. No. 61/833,080, the data line may comprise a coaxial cable. Optionally, the same cable may carry also DC power (supply). Optionally, there may be one or two carrier each for each MIPI D-PHY signal of optionally one imager each or several multiplexed to less carriers or bandwidths (time-division multiplex, space-division multiplex, frequency-division multiplex).

The system may find use of aspects described in International Publication No. WO 2013/081985 (which is hereby incorporated herein by reference in its entirety), suggesting several combinations of video data and camera control linking in between cameras, head units, bus gate way nodes, image processing ECUs and/or auxiliary devices such as like smart phones or the like.

The system includes an image processor operable to process image data captured by the camera or cameras, such as for detecting objects or other vehicles or pedestrians or the like in the field of view of one or more of the cameras. For example, the image processor may comprise an EyeQ2 or EyeQ3 image processing chip available from Mobileye Vision Technologies Ltd. of Jerusalem, Israel, and may include object detection software (such as the types described in U.S. Pat. Nos. 7,855,755; 7,720,580; and/or 7,038,577, which are hereby incorporated herein by reference in their entireties), and may analyze image data to detect vehicles and/or other objects. Responsive to such image processing, and when an object or other vehicle is detected, the system may generate an alert to the driver of the vehicle and/or may generate an overlay at the displayed image to highlight or enhance display of the detected object or vehicle, in order to enhance the driver's awareness of the detected object or vehicle or hazardous condition during a driving maneuver of the equipped vehicle.

The camera or sensor may comprise any suitable camera or sensor. Optionally, the camera may comprise a “smart camera” that includes the imaging sensor array and associated circuitry and image processing circuitry and electrical connectors and the like as part of a camera module, such as by utilizing aspects of the vision systems described in International Publication Nos. WO 2013/081984 and/or WO 2013/081985, which are hereby incorporated herein by reference in their entireties.

The vehicle may include any type of sensor or sensors, such as imaging sensors or radar sensors or lidar sensors or ladar sensors or ultrasonic sensors or the like. The imaging sensor or camera may capture image data for image processing and may comprise any suitable camera or sensing device, such as, for example, a two dimensional array of a plurality of photosensor elements arranged in at least 640 columns and 480 rows (at least a 640×480 imaging array, such as a megapixel imaging array or the like), with a respective lens focusing images onto respective portions of the array. The photosensor array may comprise a plurality of photosensor elements arranged in a photosensor array having rows and columns. Preferably, the imaging array has at least 300,000 photosensor elements or pixels, more preferably at least 500,000 photosensor elements or pixels and more preferably at least 1 million photosensor elements or pixels. The imaging array may capture color image data, such as via spectral filtering at the array, such as via an RGB (red, green and blue) filter or via a red/red complement filter or such as via an RCC (red, clear, clear) filter or the like. The logic and control circuit of the imaging sensor may function in any known manner, and the image processing and algorithmic processing may comprise any suitable means for processing the images and/or image data.

For example, the vision system and/or processing and/or camera and/or circuitry may utilize aspects described in U.S. Pat. Nos. 7,005,974; 5,760,962; 5,877,897; 5,796,094; 5,949,331; 6,222,447; 6,302,545; 6,396,397; 6,498,620; 6,523,964; 6,611,202; 6,201,642; 6,690,268; 6,717,610; 6,757,109; 6,802,617; 6,806,452; 6,822,563; 6,891,563; 6,946,978; 7,859,565; 5,550,677; 5,670,935; 6,636,258; 7,145,519; 7,161,616; 7,230,640; 7,248,283; 7,295,229; 7,301,466; 7,592,928; 7,881,496; 7,720,580; 7,038,577; 6,882,287; 5,929,786 and/or 5,786,772, and/or International Publication Nos. WO 2011/028686; WO 2010/099416; WO 2012/061567; WO 2012/068331; WO 2012/075250; WO 2012/103193; WO 2012/0116043; WO 2012/0145313; WO 2012/0145501; WO 2012/145818; WO 2012/145822; WO 2012/158167; WO 2012/075250; WO 2012/0116043; WO 2012/0145501; WO 2012/154919; WO 2013/019707; WO 2013/016409; WO 2013/019795; WO 2013/067083; WO 2013/070539; WO 2013/043661; WO 2013/048994; WO 2013/063014, WO 2013/081984; WO 2013/081985; WO 2013/074604; WO 2013/086249; WO 2013/103548; WO 2013/109869; WO 2013/123161; WO 2013/126715; WO 2013/043661 and/or WO 2013/158592, and/or U.S. patent applications, Ser. No. 14/169,329, filed Jan. 31, 2014; Ser. No. 14/169,328, filed Jan. 31, 2014; Ser. No. 14/163,325, filed Jan. 24, 2014; Ser. No. 14/159,772, filed Jan. 21, 2014; Ser. No. 14/107,624, filed Dec. 16, 2013; Ser. No. 14/102,981, filed Dec. 11, 2013; Ser. No. 14/102,980, filed Dec. 11, 2013; Ser. No. 14/098,817, filed Dec. 6, 2013; Ser. No. 14/097,581, filed Dec. 5, 2013; Ser. No. 14/093,981, filed Dec. 2, 2013; Ser. No. 14/093,980, filed Dec. 2, 2013; Ser. No. 14/082,573, filed Nov. 18, 2013; Ser. No. 14/082,574, filed Nov. 18, 2013; Ser. No. 14/082,575, filed Nov. 18, 2013; Ser. No. 14/082,577, filed Nov. 18, 2013; Ser. No. 14/071,086, filed Nov. 4, 2013; Ser. No. 14/076,524, filed Nov. 11, 2013; Ser. No. 14/052,945, filed Oct. 14, 2013; Ser. No. 14/046,174, filed Oct. 4, 2013; Ser. No. 14/016,790, filed Oct. 3, 2013; Ser. No. 14/036,723, filed Sep. 25, 2013; Ser. No. 14/016,790, filed Sep. 3, 2013; Ser. No. 14/001,272, filed Aug. 23, 2013; Ser. No. 13/970,868, filed Aug. 20, 2013; Ser. No. 13/964,134, filed Aug. 12, 2013; Ser. No. 13/942,758, filed Jul. 16, 2013; Ser. No. 13/942,753, filed Jul. 16, 2013; Ser. No. 13/927,680, filed Jun. 26, 2013; Ser. No. 13/916,051, filed Jun. 12, 2013; Ser. No. 13/894,870, filed May 15, 2013; Ser. No. 13/887,724, filed May 6, 2013; Ser. No. 13/852,190, filed Mar. 28, 2013; Ser. No. 13/851,378, filed Mar. 27, 2013; Ser. No. 13/848,796, filed Mar. 22, 2012; Ser. No. 13/847,815, filed Mar. 20, 2013;Ser. No. 13/800,697, filed Mar. 13, 2013; Ser. No. 13/785,099, filed Mar. 5, 2013; Ser. No. 13/779,881, filed Feb. 28, 2013; Ser. No. 13/774,317, filed Feb. 22, 2013; Ser. No. 13/774,315, filed Feb. 22, 2013; Ser. No. 13/681,963, filed Nov. 20, 2012; Ser. No. 13/660,306, filed Oct. 25, 2012; Ser. No. 13/653,577, filed Oct. 17, 2012; and/or Ser. No. 13/534,657, filed Jun. 27, 2012, and/or U.S. provisional applications, Ser. No. 61/935,485, filed Feb. 4, 2014; Ser. No. 61/935,057, filed Feb. 3, 2014; Ser. No. 61/935,056, filed Feb. 3, 2014; Ser. No. 61/935,055, filed Feb. 3, 2014; Ser. 61/931,811, filed Jan. 27, 2014; Ser. No. 61/919,129, filed Dec. 20, 2013; Ser. No. 61/919,130, filed Dec. 20, 2013; Ser. No. 61/919,131, filed Dec. 20, 2013; Ser. No. 61/919,147, filed Dec. 20, 2013; Ser. No. 61/919,138, filed Dec. 20, 2013, Ser. No. 61/919,133, filed Dec. 20, 2013; Ser. No. 61/918,290, filed Dec. 19, 2013; Ser. No. 61/915,218, filed Dec. 12, 2013; Ser. No. 61/912,146, filed Dec. 5, 2013; Ser. No. 61/911,666, filed Dec. 4, 2013; Ser. No. 61/911,665, filed Dec. 4, 2013; Ser. No. 61/905,461, filed Nov. 18, 2013; Ser. No. 61/905,462, filed Nov. 18, 2013; Ser. No. 61/901,127, filed Nov. 7, 2013; Ser. No. 61/895,610, filed Oct. 25, 2013; Ser. No. 61/895,609, filed Oct. 25, 2013; Ser. No. 61/879,837, filed Sep. 19, 2013; Ser. No. 61/879,835, filed Sep. 19, 2013; Ser. No. 61/878,877, filed Sep. 17, 2013; Ser. No. 61/875,351, filed Sep. 9, 2013; Ser. No. 61/869,195, filed Aug. 23, 2013; Ser. No. 61/864,835, filed Aug. 12, 2013; Ser. No. 61/864,836, filed Aug. 12, 2013; Ser. No. 61/864,837, filed Aug. 12, 2013; Ser. No. 61/864,838, filed Aug. 12, 2013; Ser. No. 61/856,843, filed Jul. 22, 2013, Ser. No. 61/845,061, filed Jul. 11, 2013; Ser. No. 61/844,630, filed Jul. 10, 2013; Ser. No. 61/844,173, filed Jul. 9, 2013; Ser. No. 61/844,171, filed Jul. 9, 2013; Ser. No. 61/842,644, filed Jul. 3, 2013; Ser. No. 61/840,542, filed Jun. 28, 2013; Ser. No. 61/838,619, filed Jun. 24, 2013; Ser. No. 61/838,621, filed Jun. 24, 2013; Ser. No. 61/837,955, filed Jun. 21, 2013; Ser. No. 61/836,900, filed Jun. 19, 2013; Ser. No. 61/836,380, filed Jun. 18, 2013; Ser. No. 61/833,080, filed Jun. 10, 2013; Ser. No. 61/830,375, filed Jun. 3, 2013; Ser. No. 61/830,377, filed Jun. 3, 2013; Ser. No. 61/825,752, filed May 21, 2013; Ser. No. 61/825,753, filed May 21, 2013; Ser. No. 61/823,648, filed May 15, 2013; Ser. No. 61/823,644, filed May 15, 2013; Ser. No. 61/821,922, filed May 10, 2013; Ser. No. 61/819,835, filed May 6, 2013; Ser. No. 61/819,033, filed May 3, 2013; Ser. No. 61/816,956, filed Apr. 29, 2013; Ser. No. 61/815,044, filed Apr. 23, 2013; Ser. No. 61/814,533, filed Apr. 22, 2013; Ser. No. 61/813,361, filed Apr. 18, 2013; Ser. No. 61/810,407, filed Apr. 10, 2013; Ser. No. 61/808,930, filed Apr. 5, 2013; Ser. No. 61/806,674, filed Mar. 29, 2013; Ser. No. 61/793,592, filed Mar. 15, 2013; Ser. No. 61/772,015, filed Mar. 4, 2013; Ser. No. 61/772,014, filed Mar. 4, 2013; Ser. No. 61/770,051, filed Feb. 27, 2013; and/or Ser. No. 61/766,883, filed Feb. 20, 2013, which are all hereby incorporated herein by reference in their entireties. The system may communicate with other communication systems via any suitable means, such as by utilizing aspects of the systems described in International Publication Nos. WO/2010/144900; WO 2013/043661 and/or WO 2013/081985, and/or U.S. patent application Ser. No. 13/202,005, filed Aug. 17, 2011, which are hereby incorporated herein by reference in their entireties.

The imaging device and control and image processor and any associated illumination source, if applicable, may comprise any suitable components, and may utilize aspects of the cameras and vision systems described in U.S. Pat. Nos. 5,550,677; 5,877,897; 6,498,620; 5,670,935; 5,796,094; 6,396,397; 6,806,452; 6,690,268; 7,005,974; 7,937,667; 7,123,168; 7,004,606; 6,946,978; 7,038,577; 6,353,392; 6,320,176; 6,313,454; and 6,824,281, and/or International Publication Nos. WO 2010/099416; WO 2011/028686; and/or WO 2013/016409, and/or U.S. Pat. Publication No. US 2010-0020170, and/or U.S. patent application Ser. No. 13/534,657, filed Jun. 27, 2012, which are all hereby incorporated herein by reference in their entireties. The camera or cameras may comprise any suitable cameras or imaging sensors or camera modules, and may utilize aspects of the cameras or sensors described in U.S. patent application Ser. No. 13/260,400, filed Sep. 26, 2011, and/or U.S. Pat. Nos. 7,965,336 and/or 7,480,149, and/or U.S. Pat. Publication No. US-2009-0244361, which are hereby incorporated herein by reference in their entireties. The imaging array sensor may comprise any suitable sensor, and may utilize various imaging sensors or imaging array sensors or cameras or the like, such as a CMOS imaging array sensor, a CCD sensor or other sensors or the like, such as the types described in U.S. Pat. Nos. 5,550,677; 5,670,935; 5,760,962; 5,715,093; 5,877,897; 6,922,292; 6,757,109; 6,717,610; 6,590,719; 6,201,642; 6,498,620; 5,796,094; 6,097,023; 6,320,176; 6,559,435; 6,831,261; 6,806,452; 6,396,397; 6,822,563; 6,946,978; 7,339,149; 7,038,577; 7,004,606; 7,720,580; and/or 7,965,336, and/or International Publication Nos. WO/2009/036176 and/or WO/2009/046268, which are all hereby incorporated herein by reference in their entireties.

The camera module and circuit chip or board and imaging sensor may be implemented and operated in connection with various vehicular vision-based systems, and/or may be operable utilizing the principles of such other vehicular systems, such as a vehicle headlamp control system, such as the type disclosed in U.S. Pat. Nos. 5,796,094; 6,097,023; 6,320,176; 6,559,435; 6,831,261; 7,004,606; 7,339,149; and/or 7,526,103, which are all hereby incorporated herein by reference in their entireties, a rain sensor, such as the types disclosed in commonly assigned U.S. Pat. Nos. 6,353,392; 6,313,454; 6,320,176; and/or 7,480,149, which are hereby incorporated herein by reference in their entireties, a vehicle vision system, such as a forwardly, sidewardly or rearwardly directed vehicle vision system utilizing principles disclosed in U.S. Pat. Nos. 5,550,677; 5,670,935; 5,760,962; 5,877,897; 5,949,331; 6,222,447; 6,302,545; 6,396,397; 6,498,620; 6,523,964; 6,611,202; 6,201,642; 6,690,268; 6,717,610; 6,757,109; 6,802,617; 6,806,452; 6,822,563; 6,891,563; 6,946,978; and/or 7,859,565, which are all hereby incorporated herein by reference in their entireties, a trailer hitching aid or tow check system, such as the type disclosed in U.S. Pat. No. 7,005,974, which is hereby incorporated herein by reference in its entirety, a reverse or sideward imaging system, such as for a lane change assistance system or lane departure warning system or for a blind spot or object detection system, such as imaging or detection systems of the types disclosed in U.S. Pat. Nos. 7,720,580; 7,038,577; 5,929,786 and/or 5,786,772, and/or U.S. patent applications, Ser. No. 11/239,980, filed Sep. 30, 2005, now U.S. Pat. No. 7,881,496, and/or U.S. provisional applications, Ser. No. 60/628,709, filed Nov. 17, 2004; Ser. No. 60/614,644, filed Sep. 30, 2004; Ser. No. 60/618,686, filed Oct. 14, 2004; Ser. No. 60/638,687, filed Dec. 23, 2004, which are hereby incorporated herein by reference in their entireties, a video device for internal cabin surveillance and/or video telephone function, such as disclosed in U.S. Pat. Nos. 5,760,962; 5,877,897; 6,690,268; and/or 7,370,983, and/or U.S. Pat. Publication No. US-2006-0050018, which are hereby incorporated herein by reference in their entireties, a traffic sign recognition system, a system for determining a distance to a leading or trailing vehicle or object, such as a system utilizing the principles disclosed in U.S. Pat. Nos. 6,396,397 and/or 7,123,168, which are hereby incorporated herein by reference in their entireties, and/or the like.

Optionally, the circuit board or chip may include circuitry for the imaging array sensor and or other electronic accessories or features, such as by utilizing compass-on-a-chip or EC driver-on-a-chip technology and aspects such as described in U.S. Pat. Nos. 7,255,451 and/or 7,480,149; and/or U.S. patent application Ser. No. 12/578,732, filed Oct. 14, 2009, and/or U.S. Publication No. US-2006-0061008, which are hereby incorporated herein by reference in their entireties.

Optionally, the vision system may include a display for displaying images captured by one or more of the imaging sensors for viewing by the driver of the vehicle while the driver is normally operating the vehicle. Optionally, for example, the vision system may include a video display device disposed at or in the interior rearview mirror assembly of the vehicle, such as by utilizing aspects of the video mirror display systems described in U.S. Pat. No. 6,690,268 and/or U.S. patent application Ser. No. 13/333,337, filed Dec. 21, 2011, which are hereby incorporated herein by reference in their entireties. The video mirror display may comprise any suitable devices and systems and optionally may utilize aspects of the compass display systems described in U.S. Pat. Nos. 7,370,983; 7,329,013; 7,308,341; 7,289,037; 7,249,860; 7,004,593; 4,546,551; 5,699,044; 4,953,305; 5,576,687; 5,632,092; 5,677,851; 5,708,410; 5,737,226; 5,802,727; 5,878,370; 6,087,953; 6,173,508; 6,222,460; 6,513,252; and/or 6,642,851, and/or European patent application, published Oct. 11, 2000 under Publication No. EP 0 1043566, and/or U.S. Pat. Publication No. US-2006-0061008, which are all hereby incorporated herein by reference in their entireties. Optionally, the video mirror display screen or device may be operable to display images captured by a rearward viewing camera of the vehicle during a reversing maneuver of the vehicle (such as responsive to the vehicle gear actuator being placed in a reverse gear position or the like) to assist the driver in backing up the vehicle, and optionally may be operable to display the compass heading or directional heading character or icon when the vehicle is not undertaking a reversing maneuver, such as when the vehicle is being driven in a forward direction along a road (such as by utilizing aspects of the display system described in International Publication No. WO 2012/051500, which is hereby incorporated herein by reference in its entirety).

Optionally, the vision system (utilizing the forward facing camera and a rearward facing camera and other cameras disposed at the vehicle with exterior fields of view) may be part of or may provide a display of a top-down view or birds-eye view system of the vehicle or a surround view at the vehicle, such as by utilizing aspects of the vision systems described in International Publication Nos. WO 2010/099416; WO 2011/028686; WO2012/075250; WO 2013/019795; WO 2012/075250; WO 2012/145822; WO 2013/081985; WO 2013/086249; and/or WO 2013/109869, and/or U.S. patent application Ser. No. 13/333,337, filed Dec. 21, 2011, which are hereby incorporated herein by reference in their entireties.

Optionally, a video mirror display may be disposed rearward of and behind the reflective element assembly of an interior rearview mirror assembly of the vehicle and may comprise a display such as the types disclosed in U.S. Pat. Nos. 5,530,240; 6,329,925; 7,855,755; 7,626,749; 7,581,859; 7,446,650; 7,370,983; 7,338,177; 7,274,501; 7,255,451; 7,195,381; 7,184,190; 5,668,663; 5,724,187 and/or 6,690,268, and/or in U.S. Pat. Publication Nos. US-2006-0061008 and/or US-2006-0050018, which are all hereby incorporated herein by reference in their entireties. The display is viewable through the reflective element when the display is activated to display information. The display element may be any type of display element, such as a vacuum fluorescent (VF) display element, a light emitting diode (LED) display element, such as an organic light emitting diode (OLED) or an inorganic light emitting diode, an electroluminescent (EL) display element, a liquid crystal display (LCD) element, a video screen display element or backlit thin film transistor (TFT) display element or the like, and may be operable to display various information (as discrete characters, icons or the like, or in a multi-pixel manner) to the driver of the vehicle, such as passenger side inflatable restraint (PSIR) information, tire pressure status, and/or the like. The mirror assembly and/or display may utilize aspects described in U.S. Pat. Nos. 7,184,190; 7,255,451; 7,446,924 and/or 7,338,177, which are all hereby incorporated herein by reference in their entireties. The thicknesses and materials of the coatings on the substrates of the reflective element may be selected to provide a desired color or tint to the mirror reflective element, such as a blue colored reflector, such as is known in the art and such as described in U.S. Pat. Nos. 5,910,854; 6,420,036; and/or 7,274,501, which are hereby incorporated herein by reference in their entireties.

Optionally, the display or displays and any associated user inputs may be associated with various accessories or systems, such as, for example, a tire pressure monitoring system or a passenger air bag status or a garage door opening system or a telematics system or any other accessory or system of the mirror assembly or of the vehicle or of an accessory module or console of the vehicle, such as an accessory module or console of the types described in U.S. Pat. Nos. 7,289,037; 6,877,888; 6,824,281; 6,690,268; 6,672,744; 6,386,742; and/or 6,124,886, and/or U.S. Pat. Publication No. US-2006-0050018, which are hereby incorporated herein by reference in their entireties.

Changes and modifications to the specifically described embodiments may be carried out without departing from the principles of the present invention, which is intended to be limited only by the scope of the appended claims as interpreted according to the principles of patent law. 

The invention claimed is:
 1. A vision system for a vehicle, said vision system comprising: an imager for a vehicular camera; a data receiving device operable to receive image data captured by said imager of said vehicular camera; a data transfer interface that communicates image data captured by said imager of said vehicular camera to said data receiving device; wherein said data transfer interface utilizes a single differential data line, and wherein transfer of captured image data comprises a signal modulated to and transferred via an analog carrier wave; wherein said single differential data line comprises a coaxial cable; wherein said coaxial cable carries DC power to said vehicular camera; wherein said vision system comprises logic that uses error correction and status checking to cope with a length of said single differential data line; wherein said logic encodes captured image data for communication via said single differential data line in a DC-balanced format; wherein said single differential data line provides monodirectional data transfer of image data captured by said imager from said vehicular camera to said data receiving device; and wherein said single differential data line provides bidirectional data transfer of other data between said vehicular camera and said data receiving device.
 2. The vision system of claim 1, wherein said single differential data line includes a back channel used for control of said imager.
 3. The vision system of claim 1, wherein a control channel is provided via a separate camera communication interface.
 4. The vision system of claim 1, wherein said single differential data line comprises a plurality of nodes.
 5. The vision system of claim 4, wherein said single differential data line uses a bi-directional high speed serial differential signaling protocol and a mixed signal PHY interface at said nodes.
 6. The vision system of claim 5, wherein said imager and said single differential data line use a MIPI D-PHY interface at one of said nodes.
 7. The vision system of claim 5, wherein said data receiving device comprises a multi standard transceiver.
 8. The vision system of claim 5, wherein said mixed signal PHY interface at each of said nodes comprises a serializer and a deserializer.
 9. The vision system of claim 5, wherein said mixed signal PHY interface comprises a logic for error correction, error and link status checking for Inventor Serial encoding/decoding an DC-balanced format either with or without additional parity or error correction information.
 10. A vision system for a vehicle, said vision system comprising: an imager for a vehicular camera; a data receiving device operable to receive image data captured by said imager of said vehicular camera; a data transfer interface that communicates image data captured by said imager of said vehicular camera to said data receiving device; wherein transfer of captured image data utilizes a single differential data line; wherein said single differential data line comprises a coaxial cable; wherein said coaxial cable carries DC power to said vehicular camera; wherein said single differential data line comprises a plurality of nodes and wherein said imager and said single differential data line use a node interface at one of said nodes; wherein said node interface at said node comprises a serializer and a deserializer; wherein said single differential data line provides monodirectional data transfer of image data captured by said imager from said vehicular camera to said data receiving device; wherein said single differential data line provides bidirectional data transfer of other data between said vehicular camera and said data receiving device; wherein said single differential data line includes a back channel used for as a control channel to control said imager; wherein transfer of captured image data comprises a signal modulated to and transferred via an analog carrier wave; wherein said vision system comprises logic that uses error correction and status checking to cope with a length of said single differential data line; and wherein said logic encodes captured image data for communication via said single differential data line in a DC-balanced format.
 11. The vision system of claim 10, wherein said control channel is provided via a separate camera communication interface.
 12. The vision system of claim 10, wherein said single differential data line uses a bi-directional high speed serial differential signaling protocol and a mixed signal PHY interface at said nodes.
 13. The vision system of claim 10, wherein said imager and said single differential data line use a MIPI D-PHY interface at said one of said nodes.
 14. A vision system for a vehicle, said vision system comprising: an imager for a vehicular camera; a data receiving device operable to receive image data captured by said imager of said vehicular camera; a data transfer interface that communicates image data captured by said imager of said vehicular camera to said data receiving device; wherein transfer of captured image data utilizes a single differential data line; wherein said single differential data line comprises a coaxial cable; wherein said coaxial cable carries DC power to said vehicular camera; wherein said single differential data line comprises a plurality of nodes and wherein said single differential data line uses a bi-directional high speed serial differential signaling protocol and a mixed signal PHY interface at said nodes; wherein said single differential data line provides monodirectional data transfer of image data captured by said imager from said vehicular camera to said data receiving device; wherein said single differential data line provides bidirectional data transfer of other data between said vehicular camera and said data receiving device; and wherein said single differential data line includes a back channel used as a control channel to control said imager; wherein transfer of captured image data comprises a signal modulated to and transferred via an analog carrier wave; wherein said vision system comprises logic that uses error correction and status checking to cope with a length of said single differential data line; and wherein said logic encodes captured image data for communication via said single differential data line in a DC-balanced format.
 15. The vision system of claim 14, wherein said imager and said single differential data line use a PHY interface at one of said nodes.
 16. The vision system of claim 14, wherein said control channel is provided via a separate camera communication interface. 